there are some mysteries in gun history I would like to post and ask nitrox if its possible to fix for the future on the top. Maybe someone , someday will knowing more about this or have similar puzzle’s.

1. the 10,75mm cartridge in the 1914 Springers Erben, Vienna 1914 catalog here

build in hammerless double and single shoot stalking rifles. Springers Erben is often seen in the same leaque like Holland & Holland.
In this time 24 austrain crowns are worth 5 dollar or 1 sovereign.

its not one of the Gruendig cartridges:10,75 x45R
x52R
x65R
this cases are conical. I didn’t find a suitable cartridge in the Georg Roth list.
This Hirtenberger made 10,75 x52R on 8x57 IR base looks similar like one in the catalog

Who know such a Springer rifle or the cartridge?